The Posterolateral Corner (PLC) is a unique structure found on the inner facing side of the knee known as medial knee. It is a combination of 28 individual static and dynamic structures out of which, the fibular (lateral) collateral ligament (FCL), popliteus tendons, and the popliteofibular ligament are the most significant parts providing the maximum stability to the knee. The converging surfaces of the tibia, fibula and femur bones provide an attachment base for these complex structures.
PLC injuries mostly occur along with other ligamentous injuries such as the ACL tears, PCL tears, or knee dislocations due to direct trauma to the anteromedial knee. Typically any forceful movements like external tibial rotation, varus (inward angulation) or hyperextension (over-straightening) can damage the PLC structure.
Moderate damage to the PLC structure can be treated by immobilization with splints/braces and some lifestyle changes for at least three to four weeks.
However, surgical treatment of a PLC injury depends on its nature, i.e. if it is chronic and in combination with other ligamentous injuries. This surgical procedure aims at performing an anatomical repair or reconstruction by attempting to reestablish the previous positions of the damaged structures and restore natural functionalities.